PA95 PA95u 1 PA95 features ? high voltage 900v (450v) ? low quiescent current 1.6ma ? high output current 100 ma ? programmable current limit applications ? high voltage instrumentation ? programmable power supplies up to 430v ? mass spectrometers ? semiconductor measurement equipment high voltage power operational amplifiers PA95 q1 q2 r1a r1b c2 12 r3 q3 cc1 cc2 q6 q5 r9 r11 2 1 r12 q29 r20 10 r27 q30 q29 q8 r4 r7 7 8 6 4 q4 ilim out q14 r19 q21 q14 +v s Cin +in Cv s r10 q5a q5b description the PA95 is a high voltage, mosfet operational am - plifer designed as a low cost solution for driving contin - uous output currents up to 100ma and pulse currents up to 200ma into capacitive loads. the safe operating area (soa) has no second breakdown limitations and can be observed for all load types by choosing an ap - propriate current limiting resistor. the mosfet output stage is biased ab for linear operation. external com - pensation provides fexibility in choosing bandwidth and slew rate for the application. apex microtechnol - ogys power sip package uses a minimum of board space allowing for high density circuit boards. the power sip package is electrically isolated. isolating thermal washers (tw13) are recommended to prevent arcing from pins to heatsink. equivalent schematic 1 2 4 6 7 8 10 12 * * * 0.01f or greater ceramic power supply bypassing required. Cin +in c c 1 c c 2 out i lim Cvs +vs c c r lim patented 8-pin sip package style dq formed leads available see package style ec external connections copyright ? apex microtechnology, inc. 2012 (all rights reserved) www.apexanalog.com oct 2012 PA95u revp
PA95 2 PA95u caution the PA95 is constructed from mosfet transistors. esd handling procedures must be observed. the exposed substrate contains beryllia (beo). do not crush, machine, or subject to temperatures in excess of 850c to avoid generating toxic fumes. parameter symbol min max units supply voltage, +v s to -v s 900 v output current, source, sink, within soa 200 ma power dissipation, continuous @ t c = 25c 30 w input voltage, differential -20 20 v input voltage, common mode (note 3) -v s v s v temperature, pin solder, 10s max. 260 c temperature, junction (note 2) 150 c temperature range, storage ?55 125 c operating temperature range, case ?40 85 c characteristics and specifications absolute maximum ratings parameter test conditions 1 min typ max units input offset voltage, initial 0.5 5 mv offset voltage vs. temperature full temperature range 15 50 v/c offset voltage vs. supply 10 25 v/v offset voltage vs. time 75 v/khz bias current, initial 200 2000 pa bias current vs. supply 4 pa/v offset current, initial 50 500 pa input resistance, dc 10 11 ? input capacitance 4 pf common mode voltage range (note 3) v s =250v v s ? 30 v common mode rejection, dc v cm = 90v 80 98 db noise 10khz bandwidth , r s = 1k 2 v rms gain open loop @ 15hz r l = 5k 94 118 db gain bandwidth product @ 1mhz r l = 5k 10 mhz power bandwidth r l = 5k 20 khz phase margin, a v = 10 full temp range 60 output voltage swing i o = 70ma v s ? 24 v s ? 20 v current, continuous 100 ma slew rate, a v = 100 c c =4.7pf 30 v/s settling time, to 0.1% 2v step 1 s resistance no load 100 specifications
PA95 PA95u 3 notes: 1. unless otherwise noted: t c = 25c, dc input specifcations are value given. power supply voltage is typical rating. c c = 4.7pf. 2. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipation to achieve high mttf. 3. although supply voltages can range up to 450v the input pins cannot swing over this range. the input pins must be at least 30v from either supply rail but not more than 500v from either supply rail. see text for a more complete description of the common mode voltage range. 4. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 5. derate max supply rating .625 v/c below 25c case. no derating needed above 25c case. typical performance graphs parameter test conditions 1 min typ max units power supply voltage (note 5) 50 300 450 v current, quiescent 1.6 2.2 ma thermal resistance, ac, junction to case (note 4) full temp range, f > 60hz 2.5 c/w resistance, dc, junction to case full temp range, f < 60hz 4.2 c/w resistance, junction to air full temp range 30 c/w temperature range, case -25 +85 c 0 25 50 75 100 125 150 temperature, t (c) 0 5 15 20 power derating internal power dissipation, p(w) 10 100 10k 1m frequency, f (hz) output current, i o (ma) output voltage swing 3 10 20 100 current limit resistor, r cl () 10 30 200 current limit current limit, i lim (ma) 50 70 5 50 20 input noise 1k 2 7 10 20 3 5 15 voltage drop from supply, v s C v o (v) 10 30 25 120 100 150 t = t c t = t a safe operating area supply to output differential, v s Cv o (v) 50 50 output current from +v s or Cv s , (ma) 5 10 15 25 dc, t c = 125c dc, t c = 85c 200ms pulse curves @ 10% duty cycle max dc, t c = 25c 100ms 100 100 150 200 250 500 1k 1m 2m 3m 4m 5m frequency, f (hz) -90 -135 -180 -225 -270 -315 -360 phase response phase, () c c = 4.7pf 100k 300k frequency, f (hz) 50 1k 500 power response output voltage, v o (v p-p ) 100 10k c c = 4.7pf 200 0 200 600 800 1000 total supply voltage, v s (v) 1.08 1.04 1.00 .96 .92 .88 quiescent current quiescent current, i (x) 400 frequency, f (hz) small signal response open loop gain, a (db) 0 60 120 20 40 80 100 100 1k 10k 100k 1m 10m 10 c c = 4.7pf input noise voltage, v n (nv/hz) 0 100 4 8 24 40 16 32 20 60 40 t c = 25c t c = C55c t c = 125c t c = 85c 80
PA95 4 PA95u typical application piezo positioning may be applied to the focusing of seg - mented mirror systems. the composite mirror may be composed of hundreds of elements, each requiring focus - ing under computer control. in such complex systems the PA95 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the sip package. phase compensation c c rated for full supply voltage. gain c c 100 4.7pf general please read application note 1 "general operating considerations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and specifcation interpretation. visit www.apexanalog.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; apex microtechnologys complete application notes library; technical seminar workbook; and evalua - tion kits. current limit for proper operation, the current limit resistor (r lim ) must be connected as shown in the external connection dia - gram. the minimum value is 3.5 ohm, however for optimum reliability the resistor value should be set as high as possible. the value is calculated as follows; with the maximum practical value of 150 ohms. .7 r lim = i lim common mode input range operational amplifers are usually designed to have a common mode input voltage range that approximates the power supply voltage range. however, to keep the cost as low as possible and still meet the requirements of most applications the common mode input voltage range of the PA95 is restricted. the input pins must always be a least 30v from either supply voltage but never more than 500v. this means that the PA95 cannot be used in applications where the supply voltages are extremely unbalanced. for example, supply voltages of +800v and C100v would not be allowed in an application where the non-inverting pin is grounded because in normal operation both input pins would be at 0v and the difference voltage between the positive supply and the input pins would be 800v. in this kind of application, however, supply voltages +500v and -100v does meet the input common mode voltage range 0 25 50 75 100 125 150 temperature, t (c) 0 5 15 20 power derating internal power dissipation, p(w) 10 100 10k 1m frequency, f (hz) output current, i o (ma) output voltage swing 3 10 20 100 current limit resistor, r cl () 10 30 200 current limit current limit, i lim (ma) 50 70 5 50 20 input noise 1k 2 7 10 20 3 5 15 voltage drop from supply, v s C v o (v) 10 30 25 120 100 150 t = t c t = t a safe operating area supply to output differential, v s Cv o (v) 50 50 output current from +v s or Cv s , (ma) 5 10 15 25 dc, t c = 125c dc, t c = 85c 200ms pulse curves @ 10% duty cycle max dc, t c = 25c 100ms 100 100 150 200 250 500 1k 1m 2m 3m 4m 5m frequency, f (hz) -90 -135 -180 -225 -270 -315 -360 phase response phase, () c c = 4.7pf 100k 300k frequency, f (hz) 50 1k 500 power response output voltage, v o (v p-p ) 100 10k c c = 4.7pf 200 0 200 600 800 1000 total supply voltage, v s (v) 1.08 1.04 1.00 .96 .92 .88 quiescent current quiescent current, i (x) 400 frequency, f (hz) small signal response open loop gain, a (db) 0 60 120 20 40 80 100 100 1k 10k 100k 1m 10m 10 c c = 4.7pf input noise voltage, v n (nv/hz) 0 100 4 8 24 40 16 32 20 60 40 t c = 25c t c = C55c t c = 125c t c = 85c 80 f r PA95 in r piezo drive s Cv s +v out v computer focus command voltage cl r 1 2 10 8 7 12
PA95 PA95u 5 requirements since the maximum difference voltage between the inputs pins and the supply voltage is 500v (the maximum allowed). the output has no such restrictions on its voltage swing. the output can swing within 24v of either supply voltage regardless of value so long as the total supply voltage does not exceed 900v. input protection although the PA95 can withstand differential input voltages up to 20v, additional external protection is recommended. in most ap - plications 1n4148 or 1n914 signal diodes are suffcient (d1, d2 in figure 1a). in more demanding applications where low leakage or low capacitance are of concern 2n4416 or 2n5457-2n5459 jfets connected as diodes will be required (q1, q2 in figure 1b). in either case the input differential voltage will be clamped to .7v. this is suffcient overdrive to produce maximum power bandwidth. note that this protection does not automatically protect the ampli - fer from excessive common mode input voltages. power supply protection unidirectional zener diode transient suppressors are recommend - ed as protection on the supply pins. the zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. whether the zeners are used or not, the system power supply should be evaluated for transient perfor - mance including power-on overshoot and power-off polarity rever - sal as well as line regulation. conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or pro - tected against. reversals or opens on the negative supply rail is known to induce input stage failure. unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifer as possible. stability the PA95 is stable at gains of 10 or more with a npo (cog) compensation capacitor of 4.7pf. the compensation capacitor, cc, in the external connections diagram must be rated at 1000v working voltage and mounted closely to pins 4 and 6 to prevent spurious oscillation. a compensation capacitor less than 4.7pf is not recommended. external components the compensation capacitor cc must be rated for the total supply voltage. an npo (cog)capacitor rated a 1kv is recommended. of equal importance are the voltage rating and voltage coeffcient of the gain setting feedback resistor. typical volt - age ratings of low wattage resistors are 150 to 250v. up to 500 v can appear across the feedback resistor. high voltage rated resistors can be obtained. however a 1 megohm feedback resistor composed of fve 200k resistors in series will produce the proper voltage rating. cautions the operating voltages of the PA95 are potentially lethal. during circuit design develop a functioning circuit at the lowest possible voltages. clip test leads should be used for "hands off" measurements while troubleshooting. PA95 +v s Cin +in z1 z2 d2 d1 12 10 1 2 +v s Cin +in z1 z2 12 10 1 2 PA95 q1 q2 a. b. Cv s Cv s figure 1. overvoltage protection
PA95 6 PA95u need technical help? contact apex support! for all apex microtechnology product questions and inquiries, call toll free 800-546-2739 in north america. for inquiries via email, please contact apex.support@apexanalog.com. international customers can also request support by contacting their local apex microtechnology sales representative. to fnd the one nearest to you, go to www.apexanalog.com important notice apex microtechnology, inc. has made every effort to insure the accuracy of the content contained in this document. however, the information is subject to change without notice and is provided "as is" without warranty of any kind (expressed or implied). apex microtechnology reserves the right to make changes without further notice to any specifcations or products mentioned herein to improve reliability. this document is the property of apex microtechnology and by furnishing this informa - tion, apex microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. apex microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the informa - tion only for use within your organization with respect to apex microtechnology integrated circuits or other products of apex microtechnology. this consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. apex microtechnology products are not designed, authorized or warranted to be suitable for use in products used for life support, automotive safety, security devices, or other critical applications. products in such applications are under - stood to be fully at the customer or the customers risk. apex microtechnology, apex and apex precision power are trademarks of apex microtechnolgy, inc. all other corporate names noted herein may be trademarks of their respective holders. copyright ? apex microtechnology, inc. 2012 (all rights reserved) www.apexanalog.com oct 2012 PA95u revp
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